Alien weed, about 2 ft tall, with green heads
from which bright yellow flowers protrude. Flowers have
four petals. Lowest leaves have one large lobe at the end
and 2-8 smaller lobes. Upper leaves are toothed.
Weedy plant that grows along the bikeway and Wildwood Drive.
A similar weed, early winter cress (B. verna)
also occurs in southwest Virginia and could be expected in the
Park. It has 8-20 lobes on its lowest leaves, and lobed